Fewer than 4 percent of lost cats brought to shelters are reunited with owners. A microchip gives pets the best chance of being identified and returned home safely should they ever become lost. A microchip is a small transponder, the size of a grain of rice, which is injected under the skin and remains there for the life of the pet. The Department scans all incoming animals for the presence of a microchip. Animal Services is then able to locate the owners information through the number on the microchip.